and environment. >> the thing that people always point to in the united states is stress. it's a vague term, means different things to different people. is stress here in the united states, we obviously know what it's like, what is it like in other places, is there less stress, did you find? >> yes, you tell people you found a blue zone, and people think well if i lived in a place like that, i would not have stress, but they worry about their kids, finances, they worry about their health, but what they have that we don't have, are daily rituals to shed that stress. in some blue zones, it's prayer, in others, it's happy hour. in one, it was naps, people take a nap, at least five days a week, have a third less heart disease than those who don't take a nap. it's just 15 minutes a day to unwind the inflammation and anxiety of every day life. >> i would love to be able to do that. it's hard, and there are other things you mentioned, the idea of investing in your friends, what did you mean by that? >> we know the happiest people in america interact face to face about six hours a day. also, who you hang